From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org, eranian@google.com,
Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 5/5] perf, x86: Prefer RDPMC over RDMSR for reading counters
Date: Wed, 06 Jun 2012 12:46:19 +0200 [thread overview]
Message-ID: <1338979579.2749.95.camel@twins> (raw)
In-Reply-To: <1338944211-28275-5-git-send-email-andi@firstfloor.org>
On Tue, 2012-06-05 at 17:56 -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@linux.intel.com>
>
> RDPMC is much faster than RDMSR for reading performance counters,
> since it's not serializing. Use it if possible in the perf handler.
>
> Only tested on Sandy Bridge, so I only enabled it there so far.
That's just stupid.. I took Vince's patch from a while back.
next prev parent reply other threads:[~2012-06-06 10:46 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-06 0:56 [PATCH 1/5] perf, x86: Don't assume the alternative cycles encoding is architectural Andi Kleen
2012-06-06 0:56 ` [PATCH 2/5] perf, x86: Don't assume there can be only 4 PEBS events Andi Kleen
2012-06-06 15:00 ` Peter Zijlstra
2012-06-06 16:10 ` Andi Kleen
2012-06-06 17:25 ` Peter Zijlstra
2012-06-06 16:17 ` [tip:perf/core] perf/x86: Don' t " tip-bot for Andi Kleen
2012-06-06 0:56 ` [PATCH 3/5] perf, x86: Check LBR format capability Andi Kleen
2012-06-06 4:29 ` Andi Kleen
2012-06-06 10:40 ` Peter Zijlstra
2012-06-06 14:14 ` Andi Kleen
2012-06-06 14:22 ` Peter Zijlstra
2012-06-06 14:37 ` Andi Kleen
2012-06-06 0:56 ` [PATCH 4/5] x86: Add rdpmcl() Andi Kleen
2012-06-06 16:16 ` [tip:perf/core] " tip-bot for Andi Kleen
2012-06-06 0:56 ` [PATCH 5/5] perf, x86: Prefer RDPMC over RDMSR for reading counters Andi Kleen
2012-06-06 10:46 ` Peter Zijlstra [this message]
2012-06-06 14:16 ` Andi Kleen
2012-06-06 14:21 ` Peter Zijlstra
2012-06-06 14:33 ` Stephane Eranian
2012-06-06 14:38 ` Peter Zijlstra
2012-06-06 14:41 ` Andi Kleen
2012-06-06 14:45 ` Peter Zijlstra
2012-06-06 10:39 ` [PATCH 1/5] perf, x86: Don't assume the alternative cycles encoding is architectural Peter Zijlstra
2012-06-06 14:12 ` Andi Kleen
2012-06-06 14:14 ` Peter Zijlstra
2012-06-06 14:23 ` Andi Kleen
2012-06-06 14:28 ` Peter Zijlstra
2012-06-06 14:35 ` Andi Kleen
2012-06-06 14:42 ` Peter Zijlstra
2012-06-06 14:49 ` Andi Kleen
2012-06-06 14:53 ` Peter Zijlstra
2012-06-06 16:08 ` Andi Kleen
2012-06-06 17:10 ` Peter Zijlstra
2012-06-06 17:48 ` Andi Kleen
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